- Alabama and Mississippi: The two states are known as the "Heart of Dixie" and share a long history and culture.
- North and South Carolina: These two states are often referred to as the "Carolinas" and have many similarities in their history, culture, and economy.
- North and South Dakota: The two states are often called the "Dakotas" and share a strong agricultural heritage and a rich Native American culture.
- Virginia and West Virginia: These two states were once part of the same state known as Virginia, and they still have many similarities in their culture and history.